<!doctype html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<iframe id="iframe" name="i" src="/common/blank.html"></iframe>
<form id="form" action="/common/blank.html?1" method="post" target="i"></form>
<script>
async_test(t => {
  window.onload = t.step_func(() => {
    navigation.onnavigate = t.step_func_done(() => {
      assert_unreached("onnavigate should not have fired in source window");
    });
    iframe.contentWindow.navigation.onnavigate = t.step_func(e => {
      assert_equals(e.navigationType, "push");
      assert_not_equals(e.formData, null);
      // NavigateEvent sourceElement is still in development, so test whether it is available.
      if ("sourceElement" in e) assert_equals(e.sourceElement, null);

      iframe.onload = t.step_func(() => {
        // Avoid the replace behavior that occurs if you navigate during the load handler
        t.step_timeout(() => {
          iframe.contentWindow.navigation.onnavigate = t.step_func(e => {
            assert_equals(e.navigationType, "push");
            assert_equals(e.formData, null);
          });

          iframe.contentWindow.onhashchange = t.step_func(() => {
            iframe.contentWindow.navigation.onnavigate = t.step_func_done(e => {
              assert_equals(e.navigationType, "traverse");
              assert_equals(e.formData, null);
            });

            // 3: go back
            iframe.contentWindow.history.back();
          });

          // 2: navigate from /common/blank.html?1-with-form-data to /common/blank.html?1#1-with-form-data
          iframe.contentWindow.location.hash = "#1";
        }, 0);
      });
    });

    // 1: submit the form, navigating from /common/blank.html to /common/blank.html?1-with-form-data
    form.submit();
  });
}, "reloading a page created from form submission results in formData of null, not the original form data");
</script>
